Question

Consider a beam of electrons (each electron with energy E₀) incident on a metal surface kept in an evacuated chamber. Then

Options:
(a) no electrons will be emitted as only photons can emit electrons.
(b) electrons can be emitted but all with an energy, E₀.
(c) electrons can be emitted with any energy, with a maximum of E₀ – φ (φ is the work function).
(d) electrons can be emitted with any energy, with a maximum of E₀.